Imagination, also called the faculty of imagining, is the ability to form new images and sensations in the mind that are not perceived through senses such as sight, hearing, or other senses.
Imagination is quite possibly a uniquely human ability. In essence, it allows us to explore ideas of things that are not in our present environment, or perhaps not even real. For example, one can imagine the cup of coffee seen the day before, or one can imagine an alien spaceship arriving in earth's orbit.